A spontaneous insult session directed at one person or group, usually lasting less than 2 minutes.

(Bob runs upstairs to grab a soda)
Person A-"Dude, Bob is such a douche!"
Person B-"oh dude I know! He is like a walking advertisement for Abercrombie and Fitch"
Person C-"He's such a baby too!"
(Bob starts to come down the stairs with soda)
Person A-"Ahhh that was a good MINI-ROAST"